Encoder Test – NoisyVolt

Basic code to test a rotary encoder connection on Teensy
Wiring
Test code:
// Rotary Encoder Test — Teensy 4.0
// 5-pin mechanical encoder (no module board)
// Wiring: A->Pin2, B->Pin3, C->GND, SW1->Pin4, SW2->GND

#include <Encoder.h>

Encoder myEnc(2, 3);

const int SW_PIN = 4;
long lastPosition = 0;
bool lastButtonState = HIGH;

void setup() {
  Serial.begin(115200);
  while (!Serial && millis() < 3000);

  // Enable internal pull-ups on all three signal pins
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(SW_PIN, INPUT_PULLUP);

  Serial.println("Rotary Encoder Test — Teensy 4.0");
  Serial.println("Rotate the knob and press the button.");
  Serial.println("-----------------------------------");
}

void loop() {
  // --- Read encoder position ---
  long newPosition = myEnc.read();

  if (newPosition != lastPosition) {
    int delta = newPosition - lastPosition;
    Serial.print("Position: ");
    Serial.print(newPosition / 4);
    Serial.print("  (raw: ");
    Serial.print(newPosition);
    Serial.print(")  Direction: ");
    Serial.println(delta > 0 ? "CW  ▶" : "CCW ◀");
    lastPosition = newPosition;
  }

  // --- Read button ---
  bool buttonState = digitalRead(SW_PIN);
  if (buttonState == LOW && lastButtonState == HIGH) {
    Serial.println(">>> Button pressed! Resetting position to 0.");
    myEnc.write(0);
    lastPosition = 0;
    delay(50);
  }
  lastButtonState = buttonState;
}
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